Knock Detection in Spark Ignition Engines Base on Complementary Ensemble Empirical Mode Decomposition-Hilbert Transform

Table 1

Test engine specifications.

Items description	Parameter
Cylinders/valves per cyl	4/4
Displacement	1.5 L
Intake type	Turbocharge
Max power	110 kW @ 5600 rpm
Max torque	210 Nm @ 2200–4500 rpm